Figure 2.

X-ray absorption spectra of the Tb M_4,5 edges for a submonolayer TbPc₂/Cu(100), measured at T ≥ 10 K and B = 6 T. The top shows the spectra for circularly polarized X-rays (black and red) and the µ⁺ − µ⁻ = XMCD signal (blue) at perpendicular photon incidence (0°). The bottom figure shows the linearly polarized absorption spectra for an incidence angle of 45°. The red line corresponds to vertical polarization, where the electric field vector is parallel to the sample plane. The black line corresponds to horizontal polarization with an angle of 45° between the electric field vector and the sample surface. The blue line is the difference, i.e., the µ_V − µ_H = XLD signal.